<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{
	margin: 0px;
	padding: 0px;
}
.shadow{
	width: 200px;
	height: 200px;
	margin: 0 auto;
	background: green;
	margin-top: 200px;
}
.shadow:hover{
	box-shadow: -10px 10px 10px black;
}
</style>



</head>

<body>
<div class="shadow"></div>

</body>
</html>
